If you're after the euro look, then a flush tailgate is a must. Everything that can be deleted or filled must be! I reckon you could get a good euro look on an s3 by refitting A3 bumpers (if they'll fit) without fogs, taking off the sideskirts, all doormouldings and maybe even fitting standard A3 wings.... now that would be interesting.
I dont know how small you could get the rims though once its lowered, but deeeeeeep dish 16"s with a nice stretch should look the part.
The difference between euro and max-poo is a world apart... now if you fitted unpainted bumpers and a 1 foot sunvisor, thats max-power.